A ninja atom ant! The birth of Ant ininMan character Henry has been with Pym. Pym, who discovered that he could manipulate the subatomic particle group through magnetic fields, he tried the sera on his own and discovered that he could reach the size of an ant. When he wanted it, he found a mixture that would shrink in size and bring it to normal size when he wanted to. He invented a helmet to communicate with the ants.